Which one is better? Thank you!
It can be divided into manual shaking way and mechanical shaking way.
Shaking includes manual shaking and mechanical shaking.
有手工摇青和机械摇青。

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Answer

You are talking about a type of machine, and this machine has a manual setting and an automatic setting? It would be helpful to know what kind of machine, but in general: 
You have the options of manual or automatic shaking.

Both are mechanical, so automatic is more correct. 
Hope that helps!

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